QcomModulePkg: Rename the partition to vendor_boot

For the boot-image header v3, the image that's generated is
named vendor_boot.img. Hence, keeping with the consistency,
the partition is named "vendor_boot". However, the bootloader
refers to the partition as "vendor-boot" (with a hiphen).
Hence, rename the references to match the partition name.

Change-Id: I4dce7a376d43acaa34cb0d14fc3a3a669d6a295c
4 files changed